"One-on-one" Vs "One-to-one"

[Brahman]

Is there any difference between the two idioms, "one-to-one" and "one-on-one", when the meaning is 'between only two persons'? Can they be used interchangeably, for instance, in the following situations?


1. The pastor had a one-to-one session with the family discussing its problems.

2. The lecturer preferred the one-on-one meetings with his students.

3. The father had a frank one-to-one discussion with his children.

4. Do not miss the chance to meet the President one-on-one.

5. The monk mentioned this during his one-to-one class with his disciples.

[Alan]

They are the same. The former is more common in AmE.